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Lots of people go to work bike. Do you know why more and more people ride bikes to work? We can answer the question in different ways. First, bikes don't need gasoline (汽油), so it doesn't cost(花费) money (钱). Second, a bike doesn't need much room, so it is to find a place for it. Third, riding a bike is good for one's . People often drive their cars everywhere, but now people think riding bikes is a good way of doing sports.